Product details:

Once your little one has outgrown the crib, this Toddler Bed Conversion Rail Kit allows you to easily convert it into a toddler bed. With a simple installation using just four included screws, you can extend the use of the crib until your child is ready for a twin bed. Measures 51.5"L x 1.125"W x 13.5"H. Compatible with the Alpha crib (M7591)* .